package com.ybkj.daijia.serverUtils;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.net.util.Base64;

/**
 * AES加解密（醉无忧 私有）
 *
 * @author 秦波
 */
public class AesEncryptUtil {

    /**
     * AES根据密钥加密
     *
     * @param content
     * @return
     * @throws NoSuchAlgorithmException
     * @throws NoSuchPaddingException
     * @throws NoSuchProviderException
     * @throws InvalidKeyException
     * @throws UnsupportedEncodingException
     * @throws BadPaddingException
     * @throws IllegalBlockSizeException
     */
    public static String AESEncode(String encodeRules, String content)
        throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException,
        UnsupportedEncodingException, IllegalBlockSizeException, BadPaddingException {
        // 1.构造密钥生成器，指定为AES算法,不区分大小写
        KeyGenerator keygen = KeyGenerator.getInstance("AES");
        // 2.根据ecnodeRules规则初始化密钥生成器
        // 生成一个128位的随机源,根据传入的字节数组
        SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
        random.setSeed(encodeRules.getBytes());
        keygen.init(128, random);
        // 3.产生原始对称密钥
        SecretKey original_key = keygen.generateKey();
        // 4.获得原始对称密钥的字节数组
        byte[] raw = original_key.getEncoded();
        // 5.根据字节数组生成AES密钥
        SecretKey key = new SecretKeySpec(raw, "AES");
        // 6.根据指定算法AES自成密码器
        Cipher cipher = Cipher.getInstance("AES");
        // 7.初始化密码器，第一个参数为加密(Encrypt_mode)或者解密解密(Decrypt_mode)操作，第二个参数为使用的KEY
        cipher.init(Cipher.ENCRYPT_MODE, key);
        // 8.获取加密内容的字节数组(这里要设置为utf-8)不然内容中如果有中文和英文混合中文就会解密为乱码
        byte[] byte_encode = content.getBytes("utf-8");
        // 9.根据密码器的初始化方式--加密：将数据加密
        byte[] byte_AES = cipher.doFinal(byte_encode);
        // 10.将加密后的数据转换为字符串
        // 解决办法：
        return new String(Base64.encodeBase64(byte_AES));
    }

    /**
     * AES根据密钥解密
     *
     * @param encodeRules 密钥
     * @param content     密文
     * @return
     * @throws UnsupportedEncodingException
     * @throws NoSuchAlgorithmException
     * @throws NoSuchPaddingException
     * @throws NoSuchProviderException
     * @throws BadPaddingException
     * @throws IllegalBlockSizeException
     * @throws InvalidKeyException
     */
    public static String AESDncode(String encodeRules, String content)
        throws UnsupportedEncodingException, NoSuchAlgorithmException, NoSuchProviderException,
        NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException {
        // 1.构造密钥生成器，指定为AES算法,不区分大小写
        KeyGenerator keygen = KeyGenerator.getInstance("AES");
        // 2.根据ecnodeRules规则初始化密钥生成器
        // 生成一个128位的随机源,根据传入的字节数组
        SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
        random.setSeed(encodeRules.getBytes());
        keygen.init(128, random);
        // 3.产生原始对称密钥
        SecretKey original_key = keygen.generateKey();
        // 4.获得原始对称密钥的字节数组
        byte[] raw = original_key.getEncoded();
        // 5.根据字节数组生成AES密钥
        SecretKey key = new SecretKeySpec(raw, "AES");
        // 6.根据指定算法AES自成密码器
        Cipher cipher = Cipher.getInstance("AES");
        // 7.初始化密码器，第一个参数为加密(Encrypt_mode)或者解密(Decrypt_mode)操作，第二个参数为使用的KEY
        cipher.init(Cipher.DECRYPT_MODE, key);
        // 8.将加密并编码后的内容解码成字节数组
        byte[] byte_content = Base64.decodeBase64(content.getBytes("utf-8"));
        // 解密
        byte[] byte_decode = cipher.doFinal(byte_content);
        return new String(byte_decode, "utf-8");
    }
}